Superalloys are metallic materials for service at high temperatures, so one of their most important properties is high temperature creep resistance. Other crucial material properties are fatigue life, phase stability, as well as oxidation and corrosion resistance.
Superalloys develop high temperature strength through solid solution strengthening. Oxidation and corrosion resistance is provided by the formation of a protective oxide layer which encapsulates the material, and thus protecting the rest of the component.
Category Archives: Superalloys
Fatigue of Nickel-Based Superalloys: Part Two
It has been discovered that it is feasible to construct parts of nickel based superalloys for use at high stress in turbines and aircraft engines with greatly reduced crack propagation rates and with good high temperature strength. The properties needed for moving parts of the engine are usually greater than those needed for static parts, although the sets of needed properties are different for the different components of an engine.
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Fatigue of Nickel-Based Superalloys: Part One
A critical property of nickel-based superalloys is their resistance to fatigue-crack propagation, particularly at service temperatures.
Many nickel-based superalloys are subject to formation of cracks or incipient cracks, either in fabrication or in use, and that the cracks can actually propagate or grow while under stress during the use in structures such as gas turbines and jet engines.